<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="bootstrap-3.4.1/css/bootstrap.css">
</head>
<body>
<div class="container" style="background-color: red;">中国</div>
<div class="container-fluid" style="background-color: red;">中国</div>
</body>
</html>